665500801667 has 4 divisors (see below), whose sum is σ = 716693171040. Its totient is φ = 614308432296.

The previous prime is 665500801663. The next prime is 665500801697. The reversal of 665500801667 is 766108005566.

665500801667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 665500801667 - 2² = 665500801663 is a prime.

It is a super-3 number, since 3×665500801667³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665500801663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25596184667 + ... + 25596184692.

It is an arithmetic number, because the mean of its divisors is an integer number (179173292760).

Almost surely, 2^665500801667 is an apocalyptic number.

665500801667 is a deficient number, since it is larger than the sum of its proper divisors (51192369373).

665500801667 is a wasteful number, since it uses less digits than its factorization.

665500801667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51192369372.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 665500801667 in words is "six hundred sixty-five billion, five hundred million, eight hundred one thousand, six hundred sixty-seven".